Mutual exclusion for computer system

Details Mutual exclusion for computer system Mutual exclusion for computer system

1992-08-17

1995-08-01

Harvey, Jack B.

Boots, shoes, and leggings

3642412, 3642416, 3642422, 3642808, 364DIG1, 3649414, 3649418, 364DIG2, 395735, 395739, G06F 946

Patent

active

054386772

ABSTRACT:
Method and apparatus of mutual exclusion for executing protected code in a computer system. If an interrupt occurs during the execution of protected code, then the computer system is reconfigured to exclude interrupts having a lower priority than the current exclusion level and the interrupt is either deferred (if it has a lower priority than the current dessired exclusion level) or serviced (if it has a priority higher than the current desked exclusion level). In some embodiments, for computer systems which use a programmable interrupt controller (PIC), the PIC is reprogrammed. In other systems using a software-controlled interrupt handling, the kernel of the operating system is informed of the change in exclusion level. In summary, the system is only configured to a new exclusion level if an interrupt actually occurs, and thus, the latency resulting from reconfiguration is not incurred if an interrupt is not generated during the execution of the protected code.

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UNIX System Laboratories, UNIX.RTM. System V Release 4, Device Driver Interface/Driver-Kernel Interface Reference Manual (1992), pertinent pages.
Intel Corporation, Peripheral Components (1991), pp. 3-171 to 3-194.

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